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7477 Datasheet(PDF) 291 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  354 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 291 Page - Renesas Technology Corp

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7470/7471/7477/7478 GROUP USER’S MANUAL
2-56
APPLICATION
2.10 Notes on programming
7470
7471
7477
7478
2.10 Notes on programming
2.10.1 Processor status register
Fig. 2.10.1 Initialization of flags in PS
(2) How to reference the processor status
register
To reference the contents of the processor
status register (PS), execute the PHP instruction
once then read the contents of (S + 1). If
necessary, execute the PLP instruction to return
the PS to its original status. A NOP instruction
should be executed after every PLP instruction.
(1) Initialization of processor status register
After a reset, the contents of the processor
status register (PS) are undefined except for
the I flag which is “1.” Therefore, flags which
affect program execution must be initialized
after a reset.
In particular, it is essential to initialize the T
and D flags because they have an important
effect on calculations.
Fig. 2.10.2 Stack memory contents after PHP
instruction execution
Fig. 2.10.3 Note to execute by PLP instruction
,,,,
Main program
Flags initializing
Reset
NOP instruction
PLP instruction
Saved PS
(S)
(S) + 1



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